1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
anyanavicka [17]
3 years ago
13

A study found that the average stopping distance of a school bus traveling 50 mph was 264 feet. a group of automotive engineers

decided to conduct a study of its school buses and found that for 40 buses, the average stopping distance of buses traveling 50 mph was 262.3 feet. the standard deviation of the population was 3.0 feet. test the claim that the average stopping distance of this company's buses is actually less than 264 feet. perform an appropriate hypothesis test. be sure to clearly define your parameter, check your conditions, and list all four steps of the test.
Mathematics
1 answer:
lutik1710 [3]3 years ago
4 0

Answer:

Step-by-step explanation:

Given that a  study found that the average stopping distance of a school bus traveling 50 mph was 264 feet.

Sample taken showed the following results

n=40\\\bar x =262.3 feet\\Std dev = \sigma= 3 ft

Since population std deviation is known and sample size is large, z test can be used.

H_0: \bar x=264\\H_a: \bar x

(Left tailed test)

Mean difference = 264-262.3 = 1.7

Std error = \frac{\sigma}{\sqrt{n} } \\=\frac{3}{\sqrt{40} } \\=0.474

Z = test statistic = mean diff/std error

= \frac{1.7}{0.474} \\=3.584

p value = 0.00017

Since p < alpha our 0.05 we reject null hypothesis

There is evidence to show that mean is less than 264 feet

(Assumptions:

Sample are randomly drawn

Sample represents the population

You might be interested in
hurry need 100 anwsers in 24 hours I'm doing a survey and want to see what is your favorite type of domesticated pet a horse b d
bagirrra123 [75]

Answer:B dog

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Can you help me Its a test pls help
xxMikexx [17]
It’s just 9 LOL yeahhhhhhhhhhhhhggg hope it goes well lollll

4 0
3 years ago
Savings account with 200$ and receive 4% interest for 7 years, how much would be in the account?
Fantom [35]

Answer:

256

Step-by-step explanation:

To calculate these kinds of things, I multiply the principal (200), the interest rate (0.04) and the time (7). This results in 56. However, since the question is how much would be in the account, it would be 200+56 which is 256.

5 0
3 years ago
|4x + 7| − 4 = 20<br> Can anyone help me with this
Reil [10]

Answer:

x = -31/4  or x = 17/4

Step-by-step explanation:

|4x + 7| − 4 = 20

⇔ |4x + 7| − 4 + 4 = 20 + 4

⇔ |4x + 7| = 24

⇔ 4x + 7 = 24  or 4x + 7 = -24

⇔ 4x = 24 - 7 or 4x = -24 - 7

⇔ 4x = 17 or 4x = -31

⇔ x = 17/4 or x = -31/4

6 0
2 years ago
Read 2 more answers
Solve for x in the following figure. Choose the appropriate result.
pickupchik [31]

Answer:

d

Step-by-step explanation:

all of the angles add up to equal 180 so we setup the equation as 45+3x=180

first you subtract each side by 45

135=3x

then you divide each side by 3 and get that

x=45

8 0
3 years ago
Read 2 more answers
Other questions:
  • A flooring company ships 13x13 inch tile in boxes of 11 tiles each, on pallets containing 40 boxes (Check Work Required. Please
    12·1 answer
  • If the diameter of a regulation size basketball is 9.4 inches, what is the surface area
    7·1 answer
  • XYZ is reflected across the line x = 3. What is the reflection image of Z?
    12·2 answers
  • The difference of two numbers is 44 1/2 . If the smaller of the two numbers increases 7 times then the difference will be 10 3/1
    7·1 answer
  • Draw an area model and then solve using the standard algorithm 27x36=
    15·1 answer
  • What is the image point of (3, – 7) after the transformation D3 o R180° ?​
    5·1 answer
  • What is the unit rate if the car is traveling<br> 170 miles in 2.5 hours?
    7·1 answer
  • At an amusement park, 15 riders ride the race cars every 20 minutes and 35 riders ride the ferris wheel every 60 minutes. Which
    8·1 answer
  • Given 1000x = 1000, what is x?
    10·2 answers
  • Solve the following proportion by cross multiplying:<br> ( x - 3 ) / 4 = ( 2x + 2 ) / 6
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!